ia64/linux-2.6.18-xen.hg

view init/do_mounts_initrd.c @ 847:ad4d307bf9ce

net sfc: Update sfc and sfc_resource driver to latest release

...and update sfc_netfront, sfc_netback, sfc_netutil for any API changes

sfc_netback: Fix asymmetric use of SFC buffer table alloc and free
sfc_netback: Clean up if no SFC accel device found
sfc_netback: Gracefully handle case where page grant fails
sfc_netback: Disable net acceleration if the physical link goes down
sfc_netfront: Less verbose error messages, more verbose counters for
rx discard errors
sfc_netfront: Gracefully handle case where SFC netfront fails during
initialisation

Signed-off-by: Kieran Mansley <kmansley@solarflare.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Mar 31 11:59:10 2009 +0100 (2009-03-31)
parents 831230e53067
children
line source
1 #define __KERNEL_SYSCALLS__
2 #include <linux/unistd.h>
3 #include <linux/kernel.h>
4 #include <linux/fs.h>
5 #include <linux/minix_fs.h>
6 #include <linux/ext2_fs.h>
7 #include <linux/romfs_fs.h>
8 #include <linux/initrd.h>
9 #include <linux/sched.h>
11 #include "do_mounts.h"
13 unsigned long initrd_start, initrd_end;
14 int initrd_below_start_ok;
15 unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */
16 static int __initdata old_fd, root_fd;
17 static int __initdata mount_initrd = 1;
19 static int __init no_initrd(char *str)
20 {
21 mount_initrd = 0;
22 return 1;
23 }
25 __setup("noinitrd", no_initrd);
27 static int __init do_linuxrc(void * shell)
28 {
29 static char *argv[] = { "linuxrc", NULL, };
30 extern char * envp_init[];
32 sys_close(old_fd);sys_close(root_fd);
33 sys_close(0);sys_close(1);sys_close(2);
34 sys_setsid();
35 (void) sys_open("/dev/console",O_RDWR,0);
36 (void) sys_dup(0);
37 (void) sys_dup(0);
38 return execve(shell, argv, envp_init);
39 }
41 static void __init handle_initrd(void)
42 {
43 int error;
44 int pid;
46 real_root_dev = new_encode_dev(ROOT_DEV);
47 create_dev("/dev/root.old", Root_RAM0);
48 /* mount initrd on rootfs' /root */
49 mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY);
50 sys_mkdir("/old", 0700);
51 root_fd = sys_open("/", 0, 0);
52 old_fd = sys_open("/old", 0, 0);
53 /* move initrd over / and chdir/chroot in initrd root */
54 sys_chdir("/root");
55 sys_mount(".", "/", NULL, MS_MOVE, NULL);
56 sys_chroot(".");
58 current->flags |= PF_NOFREEZE;
59 pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
60 if (pid > 0) {
61 while (pid != sys_wait4(-1, NULL, 0, NULL))
62 yield();
63 }
65 /* move initrd to rootfs' /old */
66 sys_fchdir(old_fd);
67 sys_mount("/", ".", NULL, MS_MOVE, NULL);
68 /* switch root and cwd back to / of rootfs */
69 sys_fchdir(root_fd);
70 sys_chroot(".");
71 sys_close(old_fd);
72 sys_close(root_fd);
74 if (new_decode_dev(real_root_dev) == Root_RAM0) {
75 sys_chdir("/old");
76 return;
77 }
79 ROOT_DEV = new_decode_dev(real_root_dev);
80 mount_root();
82 printk(KERN_NOTICE "Trying to move old root to /initrd ... ");
83 error = sys_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL);
84 if (!error)
85 printk("okay\n");
86 else {
87 int fd = sys_open("/dev/root.old", O_RDWR, 0);
88 if (error == -ENOENT)
89 printk("/initrd does not exist. Ignored.\n");
90 else
91 printk("failed\n");
92 printk(KERN_NOTICE "Unmounting old root\n");
93 sys_umount("/old", MNT_DETACH);
94 printk(KERN_NOTICE "Trying to free ramdisk memory ... ");
95 if (fd < 0) {
96 error = fd;
97 } else {
98 error = sys_ioctl(fd, BLKFLSBUF, 0);
99 sys_close(fd);
100 }
101 printk(!error ? "okay\n" : "failed\n");
102 }
103 }
105 int __init initrd_load(void)
106 {
107 if (mount_initrd) {
108 create_dev("/dev/ram", Root_RAM0);
109 /*
110 * Load the initrd data into /dev/ram0. Execute it as initrd
111 * unless /dev/ram0 is supposed to be our actual root device,
112 * in that case the ram disk is just set up here, and gets
113 * mounted in the normal path.
114 */
115 if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) {
116 sys_unlink("/initrd.image");
117 handle_initrd();
118 return 1;
119 }
120 }
121 sys_unlink("/initrd.image");
122 return 0;
123 }